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Homework Help: Find the Magnetic field

  1. Nov 8, 2011 #1
    A small wire coil K is placed at the end of the mechanical balance and inserted between the poles of the magnet as shown on the picture. Number of turns in the coil N=200, coil’s cross-section S=1 cm2, the length of arm OA (between the pivot point and counterbalancing weight) l=33 cm. The system is balanced. Now, the coil is connected to the outside circuit (not shown) and a current I=30 mA is passed through the coil. In order to keep the balance, an additional weight of delta m=55 mg is placed on the counterbalance. Find the strength of magnetic field B at the coil’s location.

    I really have no direction for this question
  2. jcsd
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